"Since then it has been very public with Oracle Linux"
Ah you're maybe referring to the CentOS-like clone they created from Red Hat's source packages. Once they spun their isos and slapped together a 3 page website they went after Red Hat's customers saying "their" so called unbreakable Linux is better than Red Hat's. That same unbreakable Linux which is based *entirely* on Red Hat's source packages. That's pretty evil in my book. Add how they are shielding off MySQL bugs and development and what they did to OpenSolaris and you get a pretty clear picture of a dinosaur-going-the-way-of-the-dodo who's trashing anything Open while giving in to its insatiable hunger for ginormous license fees and sending ginormous invoices to misguided customers for their $1000-suit "consultants".
It makes total sense to migrate to MariaDB, Percona, EnterpriseDB or PostgreSQL as fast as you can. While you are at it replace BerkeleyDB with LMDB. Last time I looked OpenLDAP, Postfix, OpenDKIM and other projects already support it. And it's faster and more reliable than BerkeleyDB too.
The only way Oracle will (hopefully) make some attempt to become a proper member of our Community is when they feel it where it hurts most: revenue streams. So slam the door in the face of that pompous Oracle rep, don't renew the license(s), drink the F/OSS Cool Aid and enjoy the view.